Scotch-yoke lubricator



Jan. 28, 1964 s. G. ENDERS SCOTCH-YOXE LUBRICATOR Filed Dec. 6, 1961FIG.3

IIIIIIIIIIIIII/fllfl FIG. 2

SHERWOOD G. ENDERS INVENTOR.

ATTORNEY United States Patent 3,119,461 SCOTCH-YOKE LUBRICATOR SherwoodG. Enders, Baltimore, Md, assignor to The Black and Decker ManufacturingCompany, Towson, Md., a corporation of Maryland Filed Dec. 6, 1961, Ser.No. 157,529 7 Claims. (Cl. 184-5) The present invention relates to aScotch-yoke lubricatcr, and more particularly, to a Scotch-yokemechanism including an eccentric and further including means to allowthe eccentric to engage a stationary lubricant applicator at one end oftravel of the reciprocating yoke.

It is an object of the present invention to provide a Scotch-yokemechanism including a reciprocating yoke having a pair of parallel sidewalls, wherein one of the side walls has an opening to allow the tip ofa stationary lubricant applicator to protrude therethrough to engage theeccentric at one end of travel of the reciprocating yoke. v

It is another object of the present invention to provide a Scotch-yokelubricator wherein the tip of a stationary lubricant applicator isreceived Within a slot formed in a. side Wall of the yoke immediatelyprevious to the end of travel of the yoke, whereby the applicator isguided within the slot for subsequent engagement with the eccentric atthe end of tra ml of the reciprocating yoke.

These and other objects of the present invention will become apparentfrom a review of the vfollowing specification, taken in conjunction withthe enclosed drawings, in which:

FIGURES :1 through 3 are sequence views showing successive stages in theoperation of the present invention, wherein the reciprocating yoke hasan opening in one of its side walls to receive the tip of a stationarylubricant applicator, the latter being adapted to engage the eccentricat the end of travel of the yoke;

FIGURE 4 is a perspective view of the Scotch-yoke mechanism, showing theslot formed in the top side Wall of the yoke;

FIGURE 5 is a side elevational view of the Scotchyoke mechanism, showingthe engagement of the eccentric with the stationary lubricantapplicator;

FIGURE 6 is a view taken along the lines 6-6 of FIGURE 4;

FIGURE 7 shows a preferred means for retaining the lubricant applicator;and

FIGURE 8 is a view taken along the lines 8-8 of FIGURE 7, showing theoil duct for replenishing the supply of lubricant in the stationaryapplicator.

Jith reference to the drawings, in particular FIG- URES 4 and 6, thereis illustrated a Scotch-yoke mechanism 16, which includes areciprocating longitudinal shaft 11, transverse yoke '12 secured to theshaft :11, and eccentric means 13 (such as a crank pin or roller) guidedwithin the guide track 14, which is formed between the parallel walls-15 and 16 of the yoke 12.

With reference to FIGURE 5, the eccentric 13 may be carried by arotating flywheel or gear 17, which is mounted on a stub shaft 18, andwhich engages a suitable pinion 19. Preferably, but not necessarily, thegear 17 is provided with one or more holes 20 so that a weight (notshown) may be inserted therein for purposes of counterbalancing themechanism 10.

With reference to FIGURES 1-4, the top side wall 15 of the yoke 12includes a slot 21, and a stationary lubricmt applicator 22. (as forexample, an oil wick) is retained by a member 23 and is adapted to bereceived partially within the slot 21 near the end of travel of the yoke12. The tip of the applicator 22 is thus guided within the slot 21 nearthe end of travel of the yoke 12, as shown in FIGURE 2; and then, asshown in FIGURE 3,

the eccentric :13 contacts the applicator 22 at the end of travel of thereciprocating yoke 12. Consequently, the

eccentric 1 3 acquires lubricant from the applicator 22 and deposits itwithin the guide track 14 of the yoke 12.

5 The physical contact between the eccentric 13 and applicator 22 isshown as occurring at the top of the stroke, that is, top of the travelof the yoke 12 and eccentric 13; but it will be appreciated 'by oneskilled in the art, that this contact could also occur at the bottom ofthe stroke as well, in which case an opening would be formed in the\bottom Wall 16 of the yoke 12, while the applicator '12 would bepositioned at the bottom of the stroke.

Moreover, the slot 21 is only one example of a variety of openings thatmay be formed in one of the side Walls 15 or 16 of the yoke 12, althoughit will be appreciated that, preferably, the opening in the side wallshould not substantially detract from the bearing surface provided bythe respective side wall for the eccentric 13.

With reference to FIGURE 7, the lubricant applicator 22 may besubstantially flat and may be retained between two members 23a and 23b,which are secured to the housing by means of screws 24 received intapped holes 25. Also, with reference to FIGURES 7 and 8, a duct 26 maybe formed in the housing 27 for purposes of replenishing the supply oflubricant in the applicator 22.

Obviously, many modifications may be made without departing from thebasic spirit of the present invention; and accordingly, within the scopeof the appended claims, the invention may be practiced other than hasbeen specifically described.

I claim:

1. In combination with a Scotch-yoke mechanism hav ing a reciprocatingyoke including a pair of parallel side walls forming a guide track foran eccentric, lubrication means comprising:

(a) a stationary lubricant applicator positioned at one end of travel ofthe reciprocating yoke; and

(b) means including an opening in one of the side walls of the yoke toallow said applicator to pro trude therethrongh to contact the eccentricat one end of travel of the yoke.

2. Lubrication means as defined in claim 1, wherein:

(a) said applicator protrudes through said opening immediately previousto the end of travel of the yoke, whereby said applicator is guided saidopening before being contacted by the eccentric.

3. Lubrication means as defined in claim 1, wherein:

(a) said applicator has a forward tip which protrudes within saidopening.

4. Lubrication means as defined in claim 1, wherein:

(a) said opening comprises a slot formed in the top side wall of theyoke, and wherein:

(b) said applicator comprises a fiat oil wick adapted to be receivedpartially within said slot.

5. In combination with a Scotch-yoke mechanism housed in a casing,wherein the mechanism has a reciprocating yoke including a pair ofparallel side walls forming a guide track for an eccentric, lubricationmeans comprising:

(a) a stationary lubricant applicator secured to the casing and having aforward tip positioned at one end of travel of the reciprocating yoke;

(b) means including a duct formed in the casing to replenish the supplyof lubricant to said applicator; and

(0) means to allow said tip of said applicator to protrude through oneof the side walls of the yoke to contact the eccentric at one end oftravel of the yoke.

6. In combination with a Scotch-yoke mechanism having a reciprocatingyoke including at least one side wall formed therein, and further havingan eccentric guided the yoke, lubrication means comprising:

3 (a) -a stationary lubricant applicator positioned at one end of travelof the reciprocating yoke, with said one side wall of the yoke beingbetween the eccentric and said applicator; (b) means to replenish thesupply of lubricant in said applicator; and

(0) means forming an opening in said one side wall of the yoke, wherebysaid applicator may protrude through said opening to engage theeccentric at the end of travel of the yoke.

7. In combination with a Scotch-yoke mechanism housed in a casing,wherein the mechanism has a reciprocating yoke including at least oneside Wall formed therein, and wherein the mechanism further has aneccentric guided within the track, lubrication means comprising:

(a) a stationary lubricant applicator disposed within the casing at oneend of travel of the reciprocating yoke, with said one side wall of theyoke being between the eccentric and the applicator;

(b) means including a holding member to secure said applicator to saidcasing;

(0) means including a duct formed in the casing to replenish the supplyof lubricant to said applicator;

(d) means forming an opening within said one side wall of the yoke; and

(e) said applicator having a forward tip which protrudes through saidopening immediately previous to the end of travel of the yoke, wherebysaid applicator is guided within said opening before being contacted bythe eccentric, and whereby the eccentric wipes against said applicatorat the end of travel of the reciprocating yoke.

References Cited in the file of this patent UNITED STATES PATENTS2,024,329 Beesley Dec. 17, 1935 2,869,231 Gury Ian. 20, 1959 2,988,924Cooley June 20; 1961 3,013,324 Robinson Dec. 19, 1961

6. IN COMBINATION WITH A SCOTCH-YOKE MECHANISM HAVING A RECIPROCATINGYOKE INCLUDING AT LEAST ONE SIDE WALL FORMED THEREIN, AND FURTHER HAVINGAN ECCENTRIC GUIDED WITHIN THE YOKE, LUBRICATION MEANS COMPRISING: (A) ASTATIONARY LUBRICANT APPLICATOR POSITIONED AT ONE END OF TRAVEL OF THERECIPROCATING YOKE, WITH SAID ONE SIDE WALL OF THE YOKE BEING BETWEENTHE ECCENTRIC AND SAID APPLICATOR;